package com.sky.aspect;

import com.sky.annotation.AutoFill;
import com.sky.constant.AutoFillConstant;
import com.sky.context.BaseContext;
import com.sky.enumeration.OperationType;
import lombok.extern.slf4j.Slf4j;
import org.aspectj.lang.JoinPoint;
import org.aspectj.lang.Signature;
import org.aspectj.lang.annotation.Aspect;
import org.aspectj.lang.annotation.Before;
import org.aspectj.lang.reflect.MethodSignature;
import org.springframework.stereotype.Component;

import java.lang.reflect.Method;
import java.time.LocalDateTime;

@Aspect
@Component
@Slf4j
public class AutoFillAspect {

    @Before("execution(* com.sky.mapper.*.*(..)) && @annotation(com.sky.annotation.AutoFill)")
    public void autoFillBefore(JoinPoint joinPoint)  {

        // 获得Method对象
        MethodSignature signature = (MethodSignature) joinPoint.getSignature();
        // 获得方法上的注解字节码对象
        AutoFill annotation = signature.getMethod().getAnnotation(AutoFill.class);
        // 获得数据库操作类型
        OperationType operationType = annotation.value();
        // 获得方法上的参数
        Object[] args = joinPoint.getArgs();
        if(args == null || args.length == 0){
            return;
        }
        Object entity = args[0];
        // 准备赋值的数据
        LocalDateTime now = LocalDateTime.now();
        Long id = BaseContext.getCurrentId();
        // 根据不同的数据库操作类型，为不同的属性通过反射赋值
        if(OperationType.INSERT == operationType){
            try {
                Method setCreateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_TIME, LocalDateTime.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);
                Method setCreateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_CREATE_USER, Long.class);
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);

                setCreateTime.invoke(entity,now);
                setUpdateTime.invoke(entity,now);
                setCreateUser.invoke(entity,id);
                setUpdateUser.invoke(entity,id);
            } catch (Exception e) {
                e.printStackTrace();
            }
        } else if (OperationType.UPDATE == operationType) {

            try {
                Method setUpdateUser = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_USER, Long.class);
                Method setUpdateTime = entity.getClass().getDeclaredMethod(AutoFillConstant.SET_UPDATE_TIME, LocalDateTime.class);

                setUpdateTime.invoke(entity,now);
                setUpdateUser.invoke(entity,id);
            } catch (Exception e) {
                e.printStackTrace();
            }

        }
    }
}
